FD 4097 then EK 370 at Bangkok
Chiang Mai → Bangkok → Siem Reap
Timetable, Bangkok time
20:05FD 4097 from Chiang Mai at the gate
19:50EK 370 to Siem Reap leaves the gate
23 h 45 apart on the timetable, overnight
EK 370 leaves 23 h 45 after FD 4097 arrives on the timetable: more than half a day, so not a connection we count.